How can I create an ideal radiant heating and/or cooling system ?

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Thank you!

My goal is to do a simulation for thermal comfort with an ideal system that would not affect humidity by providing outside air with a different humidity than the area it is heating/cooling. That's why I first thought of an ideal radiant system. But I found that the HVACTemplate:Zone:IdealLoadsAirSystem has a field called "Outdoor Air Method" that can be set to "None" to provide no outdoor air. With this configuration combined with the dehumidification and humidification fields set to none for the ideal load system, will this do the trick?

@GraitecRH ah, thanks for clarifying. In that case, yes you can leave the outdoor air & de/humidification fields to None to achieve this end. Note that the heating/cooling will now be fully convective and applied to the zone air node instead of fully radiant applied to the surfaces of the zone.

One more thing to clarify: outdoor air is usually required for health concerns and called "ventilation". In your original question, when you say "ventilation" do you mean "infiltration" -- outdoor air leaking into the zone through cracks and other means?

Yes, I think this what I want.

I do have outdoor air for coming from both ventilation (through ZoneVentilation:DesignFlowRate object), which will cover the air renewal necessary for health reasons, and infiltration (ZoneInfiltration:EffectiveLeakageArea). What I didn't want was for my ideal heating/cooling system to participate in this air renewal and affect the humidity of the zone.

Thank you very much for your help !

@GraitecRH Just to clarify, the ZoneVentilation object will affect the humidity of the zone because it introduces outdoor air as operable windows, ventilation fans, or other air renewal strategies (unless you have it set up as an exhaust fan). ZoneInfiltration does also, but it represents the leakage to/from outdoors that you can't control. So, whether you bring in air renewal via ZoneVentilation or IdealAirLoadsSystem objects, it won't matter -- the change in zone humidity will be the same if they each bring in the same amount of outdoor air.

Yes it is clear, that i will have humidity influenced by ventilation and leakage and that is what i want. I didn't want only the ideal load air system to do so.

Hello, Thanks for your answer. I though about ZoneHVAC:Baseboard:RadiantConvective:Electric , but there is no equivalent to cover for the cooling loads... Maybe combining ZoneHVAC:Baseboard:RadiantConvective:Electric for heating and HVACTemplate:Zone:IdealLoadsAirSystem for cooling could do the trick.

Yes, that is exactly what I used before - but it is not a radiant cooling system.